xz: XZ Utils1

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A free general-purpose data compression software with high
compression ratio. XZ Utils were written for POSIX-like systems
(GNU/Linux, *BSDs, etc.), but also work on some not-so-POSIX systems
like Windows. XZ Utils are the successor to LZMA Utils.

The core of the XZ Utils compression code is based on LZMA SDK, but it
has been modified quite a lot to be suitable for XZ Utils. The primary
compression algorithm is currently LZMA2, which is used inside the .xz
container format. With typical files, XZ Utils create 30 % smaller
output than gzip and 15 % smaller output than bzip2.